It's not a good week to be R&B star Mya. The singer, who performed the duet "Best of Me" with Jay Z, is discovering the hard way that Beyonce's fans are no joke: she's been receiving death threats from them after rumors have swirled all week that she is Queen Bey's hubby's long-time mistress.

The gossip -- which has been out there for some time now -- made headlines after the singer changed a lyric in one of her songs at her "On the Run" concert to suggest Jay Z has been unfaithful to her. Everyone pointed fingers at Mya, saying she and "Hova" have been a secret item for 11 years and that he even gives her money. Rather than sit back and ignore the vicious accusations, Mya tackled the rumor with the best response possible.

Never did, never was, never will ... I play second to no one, pay my own bills, have my own label, own management company, rely on God only and respect myself & marriage way too much for nonsense. False rumors are crafted for ratings & numbers.

I have yet to hear a decent fact that backs up this Mya/Jay Z claim and I'm not sure, given Jay Z's high profile, how the rapper would get away with cheating on Beyonce with another kind-of high profile singer. At some point, wouldn't someone have been able to grab a photo of them together -- sneaking into a hotel or one another's homes or whatever?

I'm not saying Jay Z didn't cheat on Beyonce -- who really knows the truth here. But it's pretty sad that super fans are giving Mya grief without knowing all of the details. And, anyway, how about blaming the man who took the marriage vow?